Extra door bell purchase where and how much

[Mikey61]

Also front door is glass cannot drill have you sticky mounting

[lettice]

This is still the case as mentioned by Sky on here last year;

You can't buy additional cameras or other smart devices I am afraid at the moment, but I did ask the Propisitons team and they've said the following: "We don't have the functionality at the moment, but it's one of our priority roadmap items, so shouldn't be too long."

https://helpforum.sky.com/t5/Sky-Protect/buying-extra-cameras/m-p/4306516#M63

For sticky mounting pads. 
You will need to purchase these yourself.

[DuncanKent]

That was well over a year ago, though. If it takes that long for things on their priority roadmap, I hate to think how long it would be for things they don't think are a priority.